-1/9x^4+2/9x^3-4x^2-2x+21=0
    0 = -3/8(x-4)²+16
    0=-3/8(x-1.6)²+16
    15=-3/8x²+16
    0=-3/8(x-4)²+16
    -x^3-6x^2-4x+8=0
    6x=(x-28)*7.2
    x/48x=48/x
    x/48x=48x
    x+1.6*(16%-x)=22%
    300/x-300/5/4x=3
    255-（1/2）a = a
    300/x-3=300÷（5/4×x）
    5000x^15+5000x^14+5000x^13+5000x^12+5000x^11 =37750
    5000x^15+5000x^14+5000x^13+5000x^12+5000x^11 =377500
    255-(5/2)t = 5t
    225-（1/2)a = a
    -13X2-32X3+108X-13/4=0
    a∧2-[(2+2√2)a∧2]/√2+2＝-a+[a(2+2√2) ]/√2
    18.2=-6t-0.1t^2

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